The cm-apptainer and cm-singularity packages have been deprecated and will be removed with BCM 11.
Upstream packages from https://apptainer.org/ or https://sylabs.io/singularity/ can be used instead.
Users on older BCM versions wishing an update of their cm-singularity (until BCM 9.1) or cm-apptainer (BCM 9.2 + 10) package can use upstream packages as well.